What is the size of Higgs boson?
In the Standard Model, the Higgs boson is expected to be very narrow: its width is roughly 4 MeV, a good 30,000 times smaller than the central mass of approximately 125 GeV.
What is Higgs decay?
The Higgs boson can decay to a lepton pair and a photon in three main ways: the leptons can be produced via an intermediate Z boson (H→Zγ→ℓℓγ) or a virtual photon (H→γ*γ→ℓℓγ), or the Higgs boson can decay to two leptons (H→ℓℓ) with one lepton radiating a final-state photon.
How many Higgs bosons are there?
In the Standard Model of particle physics, at least one Higgs boson is needed to explain fundamental particles’ masses. There is, however, no reason why there needs to be exactly one.
Is the Higgs boson Standard Model?
The Higgs boson, sometimes called the Higgs particle, is an elementary particle in the Standard Model of particle physics produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory.
What is Higgs boson particle in plain English?
The Higgs boson is the fundamental particle associated with the Higgs field, a field that gives mass to other fundamental particles such as electrons and quarks. A particle’s mass determines how much it resists changing its speed or position when it encounters a force.
Are Higgs decays consistent with the Standard Model?
The CMS measurement of the Higgs boson decay to bottom quarks is consistent with the expectations from the Standard Model. It strengthens the case that the Higgs boson couples to a class of particles called fermions, including the up and down quarks, which make up the familiar protons and neutrons.
Why are top quarks so heavy?
So, according to the theory, the top quark is so heavy because it is the closest fundamental particle. Other physicists have suggested that the Higgs, the theoretical particle that gives other particles mass, is actually made up of pairs of heavy top quarks bound together.
What is the smallest quantum particle?
Quarks
Quarks are among the smallest particles in the universe, and they carry only fractional electric charges. Scientists have a good idea of how quarks make up hadrons, but the properties of individual quarks have been difficult to tease out because they can’t be observed outside of their respective hadrons.
Is the Higgs particle a Standard Model Higgs particle?
If any of the decay probabilities are off, that means that certain matter particles in the Standard Model get mass in some more complicated way, and the Higgs particle is not a Standard Model Higgs particle, but something more complicated.
How rare is the decay of a Higgs particle?
These indirect interactions are quite a bit smaller than the direct ones, which is why these decays are rather rare, especially the decay to photons, which happens only for about 1 in 1000 Higgs particles. There is also a decay to a photon and a Z particle which I didn’t bother to put in Figure 3, but is similar to the case with two photons.
What particles does the Higgs field leave alone?
The only particles it leaves alone are the gluons and the photon (and the presumed graviton). This is all very well understood within the equations of the Standard Model of particle physics, which describe all of these particles and their fields.
What is the mass-energy of the Higgs particle?
If the Higgs particle has a mass-energy of 140 GeV, how can it decay to two Z particles, which collectively have a mass-energy of 182 GeV to start with (and possibly additional motion-energy, which is always greater than zero)?